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. Author manuscript; available in PMC: 2021 Jun 10.
Published in final edited form as: Sci Total Environ. 2019 Jul 11;691:528–537. doi: 10.1016/j.scitotenv.2019.07.114

Fig. 2.

Fig. 2.

PAH diagnostic ratio plot of Flu/(Flu+ Pyr). Standard deviation of the mean is presented. n=116, 83, 162, and 361 for the Gulf, Eastern, Southwest and Combined regions, respectively. C: Combustion; WGC: Wood, grass, coal; PC: Petroleum Combustion; P: Petroleum.